Hot-atb heating and ventilating appakatus



J. C. MILES Sept. 25. 1928.

HOT AIR HEATING AND VENTILATING APPARATUS 2 SheetsSheet Original Filed JulyB, 1925 JNVENTOR I MIL 's Sept. 25, 1928. J E Re. 17,089

Y HOT AIR HEATING AND VENTILA'I'ING ABPARATUS:

2 Sheets-Sheet 2 Original Filed July 9, 1923' ZE/YENTOR 76M!) i fk w Reissued Sept. 25, 1928.

-J'AIMIES c. fumes, or CLEVELAND, onro.

HOT-AIR HEATING AND vnnfrrta'rrns APPARATUS:

Original No. 1,600,508, dated September 2-1, 1926, reissue filed'Iune 7,

This invention relates'to apparatus used in hot air heating systems, and more particularly refers to an apparatus which may be used in such a system as is shown and described inmy application, Serial No. 430,160, filed December 13, 1920, issued September 16, 1924, Patent No. 1,508,813.

Briefly, the apparatus, illustrated in my patent, embodies a fan and a damper, which are arran ed to be positioned adjacent the inlet to the eating chamber of a furnace. The damper is arranged to be opened when the fan is stopped and to be closed when the fan is in operation, wherefore, the openings occupied bythe fan and damper provide passageways for air when thefan is stopped, while the openin occupied by the fan comprises the only i' et when the fan is in operation. Thus when nace is operating on a gravity system, and when the fan is in motion, the furnace is operating on a forced air system. I

One of the objects of this invention is'the provision of means 0 erable independently of the air ressure for e ecting a positive closure of the amper when the fan is turned on, and to obtain a positive opening of the damper when the fan is turned off. I f I I carry out the above object by employing preferably electromagnetic means which is electrically connected with the fan motor wherefore the operation of a sin le switch, automatically shuts OK the fan an opens the damper andvice versa.

The means for accomplishing the above object will be hereinafter more fully described in connection with the accompan ing draw ings, and the essential features-o my invention will be summarized in the claims.

In the drawings, Fig. 1 is a side elevation of a furnace, showing a conduit leading thereto, and illustrating my'invention within the conduit, Fig. 2 is a rear elevation of a unit embodying m invention- Fig. 3 is a horizon. tal section ta en through the conduit leading to the'furnace; Fig. 4 is a section taken on the correspondingly numbered line in Fig. 2; Fig. 5 is a wiring diagram.,

In Fig. 1, I have shown the heating chamber of a hot air furnace at 10, with an inlet housinglll, and an inlet conduit 12. Disposed across t e inlet 0 enings and adjacent the easing 11, I have i ustrated a frame which is preferably provided with openings 14 and 15 respectively. Adjacent the opening 14, I

the fan is stopped, the furserial No. 650,249, filed July 9, 1923. ap lication! 1928. Serial No. 283,673. v

have shown a fan 17 which is adapted to be i operated by a motor Disposed across the dampers 19 which are pivoted at 20, to the frame. Suitable mechanism for automatically opening the dampers simultaneously when the fan is turned off, is provided wherefore suflicient area for the admission of air to the heating chamber is obtained prevent overheating or burning out of i furnace when the-fan is stopped.

To effect an automatic operation of the dampers, consequent upon starting and stopping of the fan, I provide electromagnetic means which may be electrically connected to the motor, wherefore, the operation of a single indicated generally at 18. opening 15, I-have shown switch effects a simultaneous operation of the dampers and fan.

The preferred arrangement is indicated in, Figs. 2 and 4, wherein a solenoid 25 is disposed above the frame and centrally of the dampers. A core 26 extends vertically through the solenoid and is operatively connected with the dampers as by a pin and slotconnection 27 and 28 respectively. I

,A slot is illustrated in each arm 29 which ma extend laterally from the dampers. Norma ly, the dampers are held in open position, as shown by the broken lines in Fig. 4, by a counterweight 30, which may be carried on an extension of one of the arms. In this position, the solenoid core 26 is in a downward po sition. I

When the furnace is operating on the gravity system, the dampers are open and the fan is turned off. To effect a closure of the dampers when the fan is turned on, the solenoid winding is connected in series with the motor, wherefore, the solenoid is energized when the motor is turned on. The winding of the solenoid is such that the core 26 is adapted to be raised for closing thedampers when the current is turned on. A suitable .braclret 31 adjacent the bottom of the frame provides a satisfactory bearing or guide for the moving core. I

Assuming that a device embodying my invention is disposed across the inlet to the heating chamber of the furnace, and assuming further that switch A is closed, then the current will flow as follows. Line 40, solenoid winding 41, line 42, motor 43', line 44, switch A, and line 45. Lines 40 nd 45 are connected to a suitable source 0 electrical supply (not shown). When the motor is in fan is turned on and which is automatically i with a heating operation therefore, and the core 26 is maintained in the uppermost position wherefore the dampers- 19 are closed. As soon then the solenoid is deenergized, Wherefore the counterweight 30 being heavier than the damper, moves downwardly and thus opens the dampers, as shown by the broken lines in Fig. 4. g i

In View of the foregoing description, it will be seen that my invention provides a damper which is electrically closed when the opened when the fan is turned off. An advantage of this arrangement is that a single switch may be employed for controlling the operation of both fan and damper, and that a positive operation is effected for preventing burning out of the furnace in the event the electrical apparatus should fail.

It will also be evident that my invention provides for the automatic closing of the damper, when the fan is started, independently of the air pressure which may be built up in the heating chamber, and that the automatic closing of such damper independently of such pressure is the essence'of this invention. I claim: 1. In aheating apparatus, the combination with a heating chamber of a fan for forcing air into said chamber, a normally open damper associated with the fan for control ling-an inlet to the chamber, and means associated with the damper and operatively connected with the fan, whereby upon opera- 'tion of the fan a positive automatic closure of said damper is effected, and whereby the damper is maintained closed so long as the fan is in operation. v

2. In a heating apparatus, the combination chamber of a fan for forcing air into said chamber, a normally open damper associated with the fan and controlling an inlet to the chambenand electromagnetic means associated with the damper and electrically connected with the fan whereby upon operation of the fan a closure of said damperis effected.

3. In combination, a heating chamber having an air inlet with a damper opening and a fanopeningba fan for forcing air into the chamber through the inlet, a damper associated with said inlet, the damper being normally open so that when the fan isnot in operation, air passes into the chamber through, both the damper opening and the fan opening, and electromagnetic means for automaticallyclosing the damper when the fan is turned on whereby all of the air entering the chamber then flows through the fan opening.

4. In a heating apparatus, the combination with a heating chamber having an air inlet, of a'frame positioned across the inlet, a fan the solenoid is energized as the switch A is opened,

inlet and occupying substantially the entire the chamber through a damper intermediate the fan and one side of the frame, said damper being normally open when the fan is inoperative, and electromagnetic means for automatically closing the damper when th'efan is set in operation.

- 5. In a heating apparatus, the combination with a heating chamberhaving an air inlet, of a rectangular frame positioned across the mounted within the frame,

a motor driven fan mounted area thereof,

yieldable normally open within the frame, a

damper carried by the frame and disposed on one side of the fan, whereby air may enter the damper opening when the fan isturned ofl, and electromagnetic means for automatically closing the damper when the fan is in operation.

6. The combination with the heating chant ber of a hot air furnace havingan inlet thereto, of a frame positioned across the inlet to said chamber, a damper pivoted to the frame, mechanical means for normally holding said damper in open position, a fan for forcing air into said chamber, and electromagnetic means for automatically closing the damper when the fan is in operation.

7. The combination with the heating chamto, of a frame disposed across the inlet to said chamber, a fan mounted ad'acent said frame,

a damper pi-voted to the rame at one side of the fan, gravitational means for normally holding the damper in open position when the fan is stopped, and electromagnetic means 0 for-enabling the'damper to 'be automatically closed when the fan is in operation.

8. The combination, with the heating I chamber of a hot air furnace having an inlet thereto, of-a framedisposed across the inlet to said chamber, a damper pivoted to the frame, a counter weight on one side of the pivotal connection for normally holding the damper in open position, a fan for forcing air through the inlet into the chamber, said damper being. normally open when the fan is turned off, a solenoid electrically connected with the fan, a core for said solenoid projecting across the damper, and means operatively connecting the core with said damper whereby vertical movement of the core controls the operation of saiddamper, whereby the damper is automatically closed upon oper ation of the fan." v

9. ,The combination with theheating cham- 12 ber of a hot air furnace having an inlet thereto, of a frame disposed across the inlet, a damper pivoted-t0 the frame, a'motor driven fan disposed adjacent said frame for forcing air into the chamber, a solenoid carried by 1 25 the frame and electrically connected with said fan, a core for said solenoid disposed vertically across the damper, and being operatively connected therewith, said core being in lowermost position when the current of the motor is turned off, and the connection between the core and. dam r being such that the damper is open when t e current is turned chamber of a hot air furnace having an inlet thereto, of a frame disposed across the inlet and havingtwo openings therein, a motor driven fan disposed adjacent one of said openings for'forcing air into the chamber, a damper pivotedto the frame adjacent the other of said openings, a vertically movable member having a lost motion connection with the damper, a solenoid. surrounding the memher and being electrically connected with the motor, a counterweight carried by the damper for normally holding it in open position when the fan is turned ofi whereby all of the airenterin the chamber passes through both the fan an damper opemngs, and said member bein J so arranged thatvthe damper is closed w en the solenoid is energized and the fan is in operation, whereby all of the air then flows only through the fan opening.

11. In a heating apparatus, the combination with a heating'chamber, having an air inlet of a fan and a damper associated with the inlet, the. fan functioning when in oper-' ation to force air into said chamber, and the damper functioning to restrict the efiective.

area'of the inlet opening when the fan is in operation, and to enlarge it when the fan is stopped, and means operating independently of air pressure in the chamber for automatically 'closing the damper when the fan is started, and for opening the damper when the fan is stopped.

12. In a heating apparatus, the combination with the heating chamber of a hot air furnace having an air inlet conduit leading thereto, a frame associated with the conduit and having a fan opening and a' damper opening therein, a fan carried by the frame ad- 'acent the fan 0 ning, and a damper carried y theframe a jacent the damper opening,

said fan functioning when m operation to damper when the fan is started.

force air into said chamber for'changing the operation of the heating apparatus from a gravity toa forced air system, and means operating independently of air pressure in said chamber for automatically closing the damper when the fan is started.

13. In a heating apparatus, the combination with the heating chamber of a hot air furnace, having an air inlet conduit leading thereto, a frame associated with the conduit and having a fan opening and a damper opening therein, a fan carried by the frame adjacent the fan opening, and a damper carried by the frame adjacent the damper opening, said damper comp-rising a series of members mounted for pivotal movement on parallel axes, means for moving the members as a unit to openand close the damper, said fanfunctioning to force air into the chamber under pressure, and thereby to change the operation of the heating apparatus from a gravity to a forced air system, and mechanism for operating said means to automatically close the 14. In a heating apparatus, the combination with the heating chamber of a hot air furnace having an air inlet thereto, of a member disposed across the inlet and having two openings therein, a motor driven fan associated with one of the openings, a damper pivotally mounted on said member, and associated with the other opening, the fan being adapted, when in operation, to'force air into said chamber for increasing the air pressure therein and for changing the operation of the I furnace from a gravity to a forced air system, mechanism operating independently of the air pressure in said chamber for automatically operating the damper to restrict the efi'ective area of said inlet while the fan is in operation, whereby, all of the air entering the heating'chamber is caused to flow only through the fan so long as the fan is in operation.

In testimony whereof, I hereunto aifix my signature.

JAIMES C. MILES. 

